Begin in push up position with your chest over your hands. Bring your left knee towards your same side arm between your elbow and wrist. Repeat with your right leg, alternating at a comfortable pace. You may increase your speed.
Press your lower back on the floor as you lift your head, shoulders, and upper back. Simultaneously bring your right elbow to your left knee, while you keep your right leg straight and not touching the floor. Alternate legs and arms at a comfortable pace, you may increase speed.
Lay down flat on your back with your arms on your side for support. Raise both legs so they're off the ground, keeping the abs tight. Slowly raise your legs 90 degrees, then slowly return to starting position. Do not let legs touch the ground.
Begin by laying down with your feet on the floor, close to your hips. With your shoulders off the ground, reach as far forward as possible with one hand to touch the heel or the side of the foot. Alternate sides with each repetition.